SEXUAL REPRODUCTION 



113 



I 



F.0 34 Structural features of Peronospora tabacina. A. Dendritic spo- 



r::-;:phore at .hose ^^::::zi:: ^z'^z.^T^J^s 



S— ^s r^ar ^^^S^^st f^nlL of spor/,. D. Entrant 

 of germ tube into stomate. (Penetration may also be direct.) ^'J'^^ 

 l!T Stages in formation and maturation of oospores, as d'ssected from 

 the inierior of leaves. /. Branched haustorium, by means of x.hich the 



intercellular hyphae absorb nutriment. 



